What are the characteristics of a continental drift?

1 answer:

7 0

Continental drift was a theory that explained how continents shift position on Earth's surface. Set forth in 1912 by Alfred Wegener, a geophysicist and meteorologist, continental drift also explained why look-alike animal and plant fossils, and similar rock formations, are found on different continents.

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Write a mechanism (using curved-arrow notation) for the deprotonation of tannins in base. Use Ar-OH as a generic form of a tanni

Reika [66]

Answer:

After deprotonation of tannin, tannin (Ar-OH) is converted to $Ar-O^{-}Na^{+}$ salt which is soluble in water and $CO_{3}^{2-}$ is converted to $HCO_{3}^{-}Na^{+}$ which is also soluble in water

Explanation:

Sodium carbonate is a strong electrolyte which produces carbonate anion upon dissociation.
Carbonate ion is a strong conjugate base of weak acid $HCO_{3}^{-}$
After deprotonation of tannin, tannin (Ar-OH) is converted to $Ar-O^{-}Na^{+}$ salt which is soluble in water and $CO_{3}^{2-}$ is converted to $HCO_{3}^{-}Na^{+}$ which is also soluble in water
Balanced equation: $Ar-OH+Na_{2}CO_{3}\rightarrow Ar-O^{-}Na^{+}+Na^{+}HCO_{3}^{-}$
Mechanism has been shown below.

7 0

3 years ago

How many protons z and how many neutrons n are there in a nucleus of the most common isotope of silicon, 2814si? separate your a

Maksim231197 [3]

The Atomic Number and Atomic Mass of ²⁸Si₁₄ are 14 and 28 respectively.

Atomic Number:
Atomic Number of Element is the Number of Protons contained by the Element. So, there are 14 Protons in ²⁸Si₁₄.

Atomic Mass:
Atomic Mass of Element is the total number of Protons and Neutrons present in the Nucleus of that element.
So,
Atomic Mass = # of Protons + # of Neutrons

As the Atomic mass of ²⁸Si₁₄ is 28 and it has 14 protons, So # of Neutrons are calculated as,

# of Neutrons = Atomic Mass - # of Protons

# of Neutrons = 28 - 14

# of Neutrons = 14

Result:
In ²⁸Si₁₄ Number of Neutrons are 14, Number of Protons are 14.

Z = 14 , n = 14

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3 years ago

Which unit can be used to express the rate of a reaction?

baherus [9]

It is moldm^-3s^-1
^ means raise to power

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2 years ago

I NEED AN ANSWER TO THESE QUESTIONS ASAP!! I GOT A TEST TOMORROW ON THIS!!!

Paha777 [63]

18.The octet rule tells us that in every chemical reactions, elements will either gain or lose electrons to attain the noble gas electron configuration. This stable electron configuration is known as the octet configuration since it is composed of 8 valence. Oxygen’s electron configuration is 1s2 2s2 2p4. So when oxygen reacts with other elements to form compounds, it completes the octet configuration by taking 2 electrons from the element it reacts with

19. Actually pure metals are made up not of metal atoms but rather of closely packed cations (positively charge particles). These cations are then surrounded by a pack of mobile valence electrons which drift from one part of the metal to another. This is called metallic bond.

20. This is the energy which is needed to break a single bond. When the dissociation energy is large, this means that the compound is more stable. Since carbon to carbon bonds have high dissociation energy, therefore they are not very reactive.

21. Network solids are type of solids in which the atoms are covalently bonded to one another, so they are very stable. It takes higher temperature to melt them because breaking these covalent bonds required greater energy. Some examples are:
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3 years ago

How do you do double replacement reactions?

Harman [31]

You have to switch the elements based in if they're metals/nonmetals. so nonmetals switch with each other and metals switch with each other.

AB + CD ---> AC + BD

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2 years ago